Electrodeposited core box



Nov. 10, 1931. A. K. LAUKEL 1,831,309

' ELECTRO DEPOSITED CORE BOX I Filed Jan. 13. 1927 J gwuanto'c Patented Nov; 10, 1931 UNITED STATES ARTHUR K. LAUKEL, F DETROIT, MICHIGAN ELECTRODEPOSITED GORE BOX Application filed January 13, 1927. Serial No. 160,862.

This invention relates to the manufacture of metal core boxes by electro-deposition such as in the manner described in my pending application for Letters Patent of the United States, Serial N 0. 101,069, filed April 10, 19:26, Patent Number 1,794,627, Mar. 3, 1931,

- and has for its object to provide in a simple manner for the special protection of sharp edges about the cavity of the core box so as l to increase their resistance to wear under the abrading influence of core sand or similar material.

Generally, for the sake of cheapness and expediency in electro-deposition it is pre:

ferred to use copper as the metal of the core box, and as this metal is somewhat soft, the sharp exposed edges thereof are more or less easily burred over at the face or parting line of the box, and to resist this tendency to burr at such edges I propose to provide the core box with a face of hard metal extending to the outlines of the cavity of the box and thereby protecting the aforesaid exposed edges. It is also proposed to provide such tion in the process of manufacturing the core box, and also to effect the electro-deposition of such hard metal upon a previously deposited film of copper which is subsequently removed from the hard metal in the cleaning up of the finished core box.

Still further objects subsidiary to or resulting from the aforesaid objects or from the construction or operation of the invention as it may be carried into effect, will become apparent as the said invention is hereinafter further disclosed.

In carrying the said invention into effect I may adopt the steps hereinafter described, having reference by way of example, to the accompanying drawings, wherein Figure 1 is an elevation of a mold used in the electrolytic production of a core box;

5 Figure 2 is a transverse section of the same;

Figure 3 is a similar transverse section illustrating a mold with a face plate applied thereto and a plate of hard metal deposited on the mold at the required place;

Figure 4 is a similar view to Figure 1, il-

hard metal-face by means of electro-deposi- I lustrating the condition of the mold according to Figure 3;

Figure 5 is a transverse section of the mold after all of the plating operations are complete; a

Figure 6 is a perspective view illustrating the electro-deposited core box removed from the mold; and

Figure 7 is a fragmentary detail sectional View illustrating a modification of the process.

Similar characters of reference indicate similar parts in the several figures of the drawings.

. 1 is a mold comprising a base 2 on the face of which projects a pattern 3 for the formation of the cavity of a core box, and according to an arrangement which I have found very satisfactory, the face of the mold is recessed as at 4 for the reception of a face plate 5 of brass or similar rigid material, the inner margin 4a of the said recess 4 roughly following the outline of the projecting pattern 3. The said mold is prepared for plating by providing a conductive surface 6 on the mold immediately surrounding the pattern 3 as indicated in Figure 2, this being preferably done before the application of the face plate 5 to the mold so that the inner margins of the face plate will overlap the said conductive surface. On this surface I then electrolytically deposit a plate of metal of a wear resisting quality comparative to the principal metal of which the electrodeposited parts of the core box are to be made. Thus, where the electro-deposited core box is to be of copper the electro-deposited plate referred to may be of nickel. This is indicated by the reference numeral 7. It will be observed that this plate of nickel or wear resisting metal extends from the inner margins of the face plate 5 to and into the angles between the pattern proper 3 of the mold and the base 2 thereof.

Following this, the pattern proper 3 is provided with a conducting surface and the copper or softer metal 8 then deposited over the said pattern 3 and over the hard metal plate 7, said copper extending to and over the preferably beveled inner margins of the face late 5. During the plating operations reerred to the exposed surface of the face plate may be protected from unnecessary deposited metal thereon by a suitable insulator 9'.

After these operations have taken place the resulting shell upon removal will have the appearance indicated in Figure 6 wherein it will be seen that extending between the face plate 5 and the edges of the cavity of the instance, where the conducting surface of the mold is of silver sulphide, there may ordi-' narily be a tendency of nickel to become detached therefrom or peel, and to prevent this an initial flashing of copper is deposited on the sulphide. surface, to which flashing the nickel will adhere much more closely. The flashing may be readily removed if necessary or desirable from the surface of nickel after the removal of the shell from the mold.

A longer wearing core box may be secured in the manner described, with little difficulty,-and the said invention overcomes one of the objections sometimes met with in the use of electro-deposited copper core boxes where they are utilized in high production work and subjected to abuse in the making of cores therefrom.

This invention maybe developed within the scope of the following claims without departing from the essential features of the said invention, and it is desired that the specification and drawing be read as merely illustrative and not in a limiting sense, exceretqais necessitated by the prior art.

. at I claim is 1. The process of producing a metal core box having special provision for protection against burring, which consists in utilizing a mold having'a raised pattern-thereon in counterpart of the core box to be produced, lating the mold around the margins o the ra sed pattern with a relatively hard metal whereby such hard metal will extend into the angles between the raised pattern and the surface-of the mold, and thereafterlplating the hard metal deposit and the raised pattern with a relatively soft metal.

2.- The process of producing a metal core box having special provision for protection against burring, which consists in utilizinga mold having a raised pattern thereon 1n counterpart of the core box to he produced, plating the mold around-the marglns of the raised pattern by flashing with a metal plating the mold around the margins of the raised pattern by flashing with a metal.

adapted to support an overlaid layer of a relatively hard metal, depositing such overlaid metal upon the first plating whereby to extend into the angles between the raised pattern and the surface of the mold, and thereafter plating the hard. metal deposit and the raised pattern with a relatively soft metal.

4. The process of producing a metal core box having special provision for protection against burring, which consists. in utilizing a mold having a raised pattern thereon in counterpart of the core box to be produced,-

applying to the mold, around the margins of the raised pattern, a'relatively hard metal whereby such hard metal will extend into the angles between the raised pattern and the surface of the mold, and thereafter plating thehard metal and the raised pattern with a relatively soft metal.

In testimony whereof I aflix my signature.

ARTHUR K. LAUKEL. 

